A gunman opened fire from the 32nd floor of the Mandalay Bay Resort and Casino, aiming into a tightly packed crowd across the Las Vegas Strip at the Route 91 Harvest festival, where the singer Jason Aldean was performing.

Sisolak donated the first $10,000 and initially set the goal at $500,000. Within three hours, over $600,000 was raised with donations from more than 2,300 people. The campaign goal has been increased to $15 million, with over $9 million raised.

The verified fund will be used to "provide relief and financial support to the victims and families of the horrific Las Vegas mass shooting​," according to the page. The minimum donation to the campaign is $5.

GoFundMe is a crowdfunding website used to raise money for people and organizations. Sisolak's campaign is verified, but not all GoFundMe campaigns are.

While GoFundMe has transaction fees of 5% to 8% that can eat into a portion of donations, the site has essentially waived the fee during past tragedies. In the aftermath of the Orlando, Florida, nightclub shooting in 2016, the site donated $100,000 to a fund for victims.

Those who would rather donate without using the GoFundMe website can send a check instead, made payable to " Las Vegas Victims' Fund," to the following:

Other ways you can help Las Vegas shooting victims

You can also donate money to the National Compassion Fund here, which will donate 100% of funds raised directly to victims.

People in the Las Vegas area can donate blood to participating hospitals and clinics. The Las Vegas Metropolitan Police Department's Twitter account is continually updating its page with locations in the Las Vegas area that are accepting blood donations.